Drill.



B. M. W. HANSON DRILL.

APPLICATION FILED J-AN.15, 1914.

Patented July 28, 1914.

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Witnesses:

UNITED STATES PATENT OFFICE.

IBEN'GT m. w. HANSON, or naarronn, connncrrcun'assrenoaro rna'rr & winning compan or nan'rroan, connncrrcnr, A conrqnarron or new DRILL.-

To all whom it may concern:

" Beit known that I, BENGT- M. W. I-Lusson,

a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have inventedncertain new and useful Improvements inDrills, of which the following is a specification.

This invention relates to drills, one of the primary objects of the inventionbeing the provisionof an article of thischaracter by which chips can be discharged with oer-- tainty and positiveness from-'the cutting zone. There are several advantages arising from this partlcular construction, one being '15 the facility and freeness with which the drill cuts and the otherits rapidity of action ascom'pared with those of the ordinary kind. In the drawings 'accompanyingand form-. ing part of the presents ecification I have all shown in detail one of t e many different forms of embodiment of the invention, which to-enable those skilled inthe art to practice the same will be setforth fully in the following description. "I do not limit myself to this disclosure; I may depart therefrom in radicalrespects "withinthe scope of the r invention defined claims following a descriptioe Referring to said drawings: Figure '30 top plan view'of a drill embodying my 111',

ventiong. Fig; 2 a side elevation ofsaid drili, Fig. 3 is a bottom .plan viewr of the same. Fig, 4 is a front elevation of said drill. Fig. 5 is a transverse section 'onthe 135 line'55 of Fig.- 3,; and,.Fig. 6 s a. rear the rill. In conjunction with the drill ere '50 is means whereby lubricant or someianal ogous substances, can be sup lied'to-the cut tiring-zone, and while this ubricant or its q a en' c n e rn shed in y d ira h manner, I prefer that the drill ltself have disadvantage in question is, not

tudinalhvlf of is ma up of a. bodymemberas 3, 11 bit member as 4, the inner portion of the Patented July 28, 1914;)

Application iiled lfanuary 15, 1914. Serial No. 812,264.

duct means for the conveyance thereof to the cutting-zone, the lubricant which is generally supplied under pressure, being preferably utilized to expel the chipsfrom said cutting-zone and force the same into and along the chip-outlet The drill of ordinary kind comprises as is known a plurality of lips, usually two, and a corresponding nulnber of flutes which convey the chips away, from the respective cutting-1i s .There is an inherent disadvantage in t is old form of drill, as I will now explain. It has been the custom to utilize the pressure of the lubricating substance of whatever nature the same may be, to force the chips intoa'nd along the flutes ofthe old drill. They of course are disposed therein at and around the lips. It is obvious that the resistane oifered by the; twoflmasses/ of chips in the flutes is not the same, the consequence being that the lubricant will naturally take the I path of leastres'istanc'e which willbe along the flute containin that mass of chips which. offers the less resistance to the onflowing lubricant, b reason of which one flute wili be freedre atively speaking, of they chips 30 while the otherwill not and the chips continuing to pack therein, can be removed only by independent influence. B p'rpv'ding a drill of the novel kind set orth, t e

I 'ossible, for. 35 there is only one path for the c ips to take and the lubricant must ,of necessity and imperatively'force thegchips along this path,

so that clogging or choking by the'chips of the, single flute is practically impossible. The chips may at times under unusual 'condi 1 ti'ons, pack in and, around the cuttingizone, but they must with certainty ultimately. be

expelled'therefrom .by the pressure of the. lubricant. 4

I wish to make clear the fact that my invention consistsin certain broad.- relations and n in a y de a I. v n mer ly shown one of then'umer'ous forms t ereofn order to comply with the statutes, and which -I consider to be the best, afterex 'ri1nent.

t b f gQ general: 6 s rat qes I will now refer more in detail to what is; shown" in the drawings, The d;'jI1.;-,i q I prises a shank denotedfin a general wayfby .105 2. i For! facility of manufacture th s mt bit member 4 being; circumferentially reduced to cylindrical form as at'5 to closely fit a correspondingly-shaped socket as 6 at .the forward end of the body member 3.

At the tip 0f the shank2 is a wing or blade 7 formed by cuttin away the stockat the .forward end of the s ank 2, this wing as will hereinafter appear carrying cutting lips which constitute suitable cutting portlons and which in the construction shown, are

transverse to the chip-outlet or at least to the entering end thereof.- As will herein-- The angular 'sur aces 8 have cutting por-' tions as the edges 9 at opposite sides of the wing 7, and these cuttin edges9 radial to the longitudinal axisof t e drill, present the lips proper. Each inclined surface 8 is on a back taper to present a relief, further chipclearance being provided by forming on the opposite. surfaces of the wing 7 the'relief portions 11. It should be noted that one side of the wing 7, thatto the right in Fig. 2, is flush with the'uncut part of the. shank 2. 'Attention is called to the factthat the wing is of progressively increasing thickness com mencmg at its to or crown, the thicker por-.

tion of the wing eing at what might prop erly be considered the base thereof to thereb more effectually resist torsion and other e ects present in work.

As shown the shank 2 has a straight flute or groove as 12 extending from practically the; butt or tang of the shank 3 uninterruptedly to the base of the wing 7, and this" as already notedconstitutes one of the several convenient chip-outlets. The sides of the 7 are upon rearwardly converging an es as at 13 to provide for further relie The rear portion of the wing 7 it will be seen, commencing at its top s upon a gentle curve as at 13 merging iractic'ally unbrokenly into the bottom of the forward fo'rlinitially flute. or groove 12. a 7

or inlet-portion of the outlet or duct 12.

The shank 2 at opposite sides of the wing-7 has duplicate curved surfaces 14, the curves of WhlCh mer e unbrokenly into the side curved faces 0 the wing 7 and also into the forward portion of the flute or groove 12.

These surfaces 14 constitute As thedrill turns in a hole the o positelydisposed lips 9 will cut and. the c ps pass onto the respective guide surfaces 14' from,

whence they are, directed into the entering end of the flute or groove12, this action-be.-

in as already setforth' a forced oneand the 'lu rieantiwhich ieutilized for lubricating sible.

guide portions directing the chips toward the longitudinall extending flute anda wing the area to becut presentinga convenient means of effecting with certainty the discharge .of the chips not only into but along the duct or roove12, so that blocking or choking of t e chi s in the-hole being cut or in the chip-out et is practically impos- As I have already stated the lubricant or other chip-forcing substance can be conveyed to the cutting-portion of the drill in any desirable manner. I get the best results, however, by conducting it through the drill itself and will now describe one of the many means whereby this particular function can be accom lished. Extending longitudinally of the s ank 2 is a duct 15 which may besupplied at its outer open end with oil in any desirable manner for instance channel 16. .The duct 15 takes a slight dip. .beyond the forward end-of the cover piece 17 and is continued in such closed relation into the bit member 4,. and has in the bit member branches as 18, the branches diverging forwardly and having elongated mouths opening into ofiposite sides of the wing 7, so that the o is discharged approximatel directly at the cutting portion of the I have already referred to the fact that thebit member 4 has a cylindrical projection '5 driven. into the corres ondingly shaped socket 6. For additiona security the. body member and .bit member may be keyed together for instance as follows: As

shown the forward portion of the body member 3 has projecting keys '19 adapted to fit closely keyways or seats 20in the bit member. Thereina be also adapted to be iven into registering openin in the body member 3 and bit member 4.

at I claim is:

provideda pin 21 Y' 1. A' drill having a plurality of cutting- 1 portions, a chip-outletcommon to said cutting portions, and a duct extending longitudinally of the having branches leadmg to the respectlve cutting portions to convey a lubricant thereto for forcing the chips into said chip-outlet.

2. A drill comprising a shank having a .at a roximate y right angles to the flute rovgcfed with oppositely disposed cuttinge ges. I

3. A drill comprising a shank havinga singleflute, and also having a 'at approximately right angles to the entering end of theflute, the having oppositely disposed cutting portions and the shank having chip-directing surfaces at the base ofthe wing leading into said flute.

4. A drill comprising a shank having a 5 flute and a wing, to the base ofowhich said flute leads, said wing having a plurality of cutting portions. p I x 5. A drill comprising a shank having a flute and a wing, to the base of which said flute leads, said wing having a plurality of v cutting portions, and its sides being on rearwardly converglng angles. 6. A drill comprising a shank. having a flute and a wing having cuttin portions, the flute extending to the base 0 the wing, the shank having chip-directing surfaces at apposite sides of the wing, leading into said ute.

flute provided with cutting portions, an a wing, the flute extending to the base of the faces at opposite sides of the wing, leadm ngitud1- into said flute, and also having a 10 I nally-extending duct provided with branches 7. A drill comprising a shank havin a opening into the opposite sides of the wing.

In testimony whereof I aflix my signature in presence of two witnesses. Y v

. 4 B'ENGT M. W. HANSON. Witnesses:

W. M. S'roRRs,

C. M. GELLER'TH 

